1. The clipper needs to be drop the oil in the middle and both ends of the cutting blade before using to check it will eliminate noise or not. If not, you need to apply for after-sales service;
2. Check whether the cutting head is installed properly and reinstall it to confirm whether it can be solved. If the situation is still the same, apply for after-sales service;
3. if the equipment falls down, the cutter head, motor, battery and internal structure will be damaged, so it needs to apply for after-sales service.